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The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Link: https://lore.kernel.org/r/20200213010425.GA13068@embeddedor.com
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> # added a few more
139 lines
4.0 KiB
C
139 lines
4.0 KiB
C
#ifndef _OPA_VNIC_H
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#define _OPA_VNIC_H
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/*
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* Copyright(c) 2017 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* This file contains Intel Omni-Path (OPA) Virtual Network Interface
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* Controller (VNIC) specific declarations.
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*/
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#include <rdma/ib_verbs.h>
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/* 16 header bytes + 2 reserved bytes */
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#define OPA_VNIC_L2_HDR_LEN (16 + 2)
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#define OPA_VNIC_L4_HDR_LEN 2
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#define OPA_VNIC_HDR_LEN (OPA_VNIC_L2_HDR_LEN + \
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OPA_VNIC_L4_HDR_LEN)
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#define OPA_VNIC_L4_ETHR 0x78
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#define OPA_VNIC_ICRC_LEN 4
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#define OPA_VNIC_TAIL_LEN 1
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#define OPA_VNIC_ICRC_TAIL_LEN (OPA_VNIC_ICRC_LEN + OPA_VNIC_TAIL_LEN)
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#define OPA_VNIC_SKB_MDATA_LEN 4
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#define OPA_VNIC_SKB_MDATA_ENCAP_ERR 0x1
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/* opa vnic rdma netdev's private data structure */
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struct opa_vnic_rdma_netdev {
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struct rdma_netdev rn; /* keep this first */
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/* followed by device private data */
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char *dev_priv[];
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};
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static inline void *opa_vnic_priv(const struct net_device *dev)
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{
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struct rdma_netdev *rn = netdev_priv(dev);
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return rn->clnt_priv;
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}
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static inline void *opa_vnic_dev_priv(const struct net_device *dev)
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{
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struct opa_vnic_rdma_netdev *oparn = netdev_priv(dev);
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return oparn->dev_priv;
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}
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/* opa_vnic skb meta data structrue */
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struct opa_vnic_skb_mdata {
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u8 vl;
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u8 entropy;
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u8 flags;
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u8 rsvd;
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} __packed;
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/* OPA VNIC group statistics */
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struct opa_vnic_grp_stats {
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u64 unicast;
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u64 mcastbcast;
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u64 untagged;
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u64 vlan;
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u64 s_64;
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u64 s_65_127;
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u64 s_128_255;
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u64 s_256_511;
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u64 s_512_1023;
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u64 s_1024_1518;
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u64 s_1519_max;
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};
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struct opa_vnic_stats {
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/* standard netdev statistics */
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struct rtnl_link_stats64 netstats;
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/* OPA VNIC statistics */
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struct opa_vnic_grp_stats tx_grp;
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struct opa_vnic_grp_stats rx_grp;
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u64 tx_dlid_zero;
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u64 tx_drop_state;
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u64 rx_drop_state;
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u64 rx_runt;
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u64 rx_oversize;
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};
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static inline bool rdma_cap_opa_vnic(struct ib_device *device)
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{
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return !!(device->attrs.device_cap_flags &
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IB_DEVICE_RDMA_NETDEV_OPA_VNIC);
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}
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#endif /* _OPA_VNIC_H */
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